The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) established the Congestion Mitigation and Air Quality Improvement (CMAQ) Program. The CMAQ Program emphasizes the importance of the link between transportation and air quality, by providing 6 billion dollars between 1992-1997 for transportation projects and programs to improve air quality. Consequently, many areas will be able to implement transportation control measures (TCMs), in compliance with the mandates of the Clean Air Act Amendments of 1990 (CAAA).

The Congestion Mitigation and Air Quality Improvement (CMAQ) program was enacted as part of the surface transportation legislation. This work recommends that Congress retain the sole federal surface transportation program that funds projects to reduce pollution and traffic congestion in areas that must comply with national air quality standards.

Of congestion management system activities in states and metropolitan planning organizations -- Analytical procedures to support a congestion management review.